FUNCTION SMC_GetObjFromHistory : POINTER TO SMC_GEOINFO
Returns an object that has been deleted but not yet overwritten. For N >= 0, SMC_GetObjFromHistory(poq, N) = SMC_GetObj(poq, N). For negative N, the objects from the history are retrieved. (N=-1 gets the newest object from history, smaller N get older elements). The valid range for N is -SMC_GetHistoryCount(poq) ... SMC_GetCount(poq) - 1.
Note
This function should only be used from the task that is reading and deleting elements from the queue.
InOut:
|
Scope |
Name |
Type |
Comment |
|
Return |
SMC_GetObjFromHistory |
POINTER TO SMC_GEOINFO |
|
|
Input |
poq |
POINTER TO SMC_OUTQUEUE |
The out queue |
|
N |
DINT |
Index of the object, counting is started with N=0 |
